I'm not sure whether your main issue is print isn't adding spaces when you print a list, or that what you really want to do is push onto an array a string consisting of another list joined with spaces. If the latter, Mugatu is right. If the former, then you can do either

push @out, reverse @array;
print join " ", @out;
[download]

or

push @out, reverse @array;
{ 
   local $, = " ";
   print @out;
}
[download]

Update: forgot the reverse